series,x,y Collection efficiency 0.7,1,0.14 Collection efficiency 0.7,2,0.28 Collection efficiency 0.7,3,0.42 Collection efficiency 0.7,4,0.56 Collection efficiency 0.7,5,0.7 Collection efficiency 0.7,6,0.84 Ideal collection,1,0.2 Ideal collection,2,0.4 Ideal collection,3,0.6 Ideal collection,4,0.8 Ideal collection,5,1 Ideal collection,6,1.2